Interior Space and Exhibition Design Daya Global Headquarters Office Interior Design by Calvin Chen Daya Global Headquarters is an office interior design covering 2500 square meters. The layout uses the window as its basic structure. All functional spaces are set back from the windows, and the proportions of the framing are carefully defined. A long corridor brings the outside view deep into the interior. Black tones, gravel colors, Roman cave stone, glass and small areas of mirror stainless steel shape the surfaces, while wool carpets provide a quiet background. Art sandstone paint is applied as a gradient, from coarse grains near the core to a smooth touch toward the windows.